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July 28th, 2014, 04:56 PM   #1
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What in terms of x, is 30% of 3y?

If 30% of y is equal to x, what, in terms of x, is 30% of 3y?

30% of y=$\displaystyle \frac{30}{100}\times{y}=\frac{3}{10}\times{y}$
$\longrightarrow$
$\frac{3}{10}\times{y}=x$

30% of 3y =$\frac{3}{10}\times3y$
What do I make of these?

Last edited by Chikis; July 28th, 2014 at 05:17 PM.
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July 28th, 2014, 06:10 PM   #2
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$$3y = 3 \times y \\
a \times ( b \times c ) = a \times ( c \times b ) = ( a \times c ) \times b$$
Because multiplication is both commutative and associative.
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July 28th, 2014, 06:39 PM   #3
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30% of y is equal to x means 0.3y=x,
30% of 3y means 0.3*3y=3*0.3y=3x......
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July 28th, 2014, 06:48 PM   #4
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.3y = x
.3(3y) = 3x or 3(.3y) = 3x (each side has been multiplied by 3)

I see you're still wearing your priestly robe, Chikis...
Do you sell holy water?

Last edited by Denis; July 28th, 2014 at 06:51 PM.
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July 28th, 2014, 09:41 PM   #5
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So what, in terms of x, is 30% of 3y?
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July 28th, 2014, 09:52 PM   #6
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Quote:
Originally Posted by Chikis View Post
So what, in terms of x, is 30% of 3y?
Oh my God. I just committed suicide (And was resurrected ).
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